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March 1, 2015

Posted by **Master chief** on Monday, June 6, 2011 at 4:00pm.

sec 3pi/2

- Trig -
**bobpursley**, Monday, June 6, 2011 at 4:20pmwell, it is .... 270 degrees....so cosine of 0 is 1, cosine 90 is 0, cosine 180 is -1, cosine 270 is o, so sec = 1/cosine= undetermined...

- Trig -
**Reiny**, Monday, June 6, 2011 at 4:22pmAt 3π/2, a rotating arm ends up on the negative y-axis (270°)

If we consider a unit circle, then the terminal arm ends up at (0,-1), that is,

x=0, y = -1, r = 1

cos (3π/2) = 0/1 = 0

so sec(3π/2) = 1/cos(3π/2) = 1/0

which would be undefined.

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